植物组织装片的显微照片,要比挂图更具有直观性。这类照片在实验课中运用具有以下几方面的优点:1.挂图往往只是一张较为模式的图,而显微照片是装片的直接放大。挂图与实物之间有一定的差异,显微照片能反映装片实物的真实面貌,如蚕豆叶的横切面挂图上所画的栅栏组织和海绵组织的细胞排列紧密,而实际上装片中这两种组织的细胞排列并非如此紧密。 Photomicrographs of plant tissue loading are more intuitive than wall charts. The use of such photos in experimental classes has the following advantages: 1. The wall chart is often just a comparative pattern, and the micrograph is a direct enlargement of the film. There is a certain difference between wall charts and physical objects. Micrographs can reflect the actual appearance of the physical objects. For example, the palisade tissue drawn on the cross-section wall chart of the broad bean leaves and the cells of the sponge tissue are closely arranged. The cell arrangement of the tissue is not so compact.